Controller for electric motor

  • US 10,298,158 B2
  • Filed: 01/06/2015
  • Issued: 05/21/2019
  • Est. Priority Date: 01/10/2014
  • Status: Active Grant
First Claim
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1. A controller for an electric motor, said controller controlling a synchronous motor, said controller comprising:

  • an electric motor drive unit that applies a voltage based on a voltage command to said synchronous motor;

    a feedback amount calculation unit that decides a feedback amount based on a deviation of a current flowing through said synchronous motor from a command value of said current or a deviation of an air-gap flux in said synchronous motor from a command value of said air-gap flux;

    a voltage command generation unit that generates said voltage command on the basis of said feedback amount;

    a voltage error calculation unit that calculates a range in which an error between a voltage value based on a voltage equation of said synchronous motor and said voltage command varies; and

    a determination unit that determines an occurrence of an abnormality in said synchronous motor when said feedback amount deviates from the range in which said error varies,wherein said error is set on the basis of a variation range decided by at least one of said current, said voltage command, a manufacturing tolerance or a range of guarantee of an operating temperature of said synchronous motor, a manufacturing tolerance or a range of guarantee of an operating temperature of said electric motor drive unit, a manufacturing tolerance or a range of guarantee or an operating temperature of a detector that detects said current or said voltage, or a rotation angle velocity of said synchronous motor.

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